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  // UART configuration
  uart_config_t uart_config = {
  .baud_rate = UPDI_BAUD,
  .data_bits = UART_DATA_8_BITS,
  .parity = UART_PARITY_EVEN,
  .stop_bits = UART_STOP_BITS_2,
  .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
  .rx_flow_ctrl_thresh = 0,
  .source_clk = UART_SCLK_APB,
  };

  // Configure UART parameters
  uart_param_config(UPDI_UART_NUM, &uart_config);
  // Set UART pins
  uart_set_pin(UPDI_UART_NUM, UPDI_RX_PIN, UPDI_TX_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
  // Install UART driver
  uart_driver_install(UPDI_UART_NUM, 1024 * 2, 0, 0, NULL, 0);

  // Set UART read timeout
  uart_set_rx_timeout(UPDI_UART_NUM, 50);
  const gpio_config_t pin_cfg {
    .pin_bit_mask = (1ul << GPIO_NUM_8) | (1ul << GPIO_NUM_2),
    .mode = GPIO_MODE_INPUT_OUTPUT_OD, // Input and Output w/ open-drain!
    .pull_up_en = GPIO_PULLUP_ENABLE, // Open-drain requires a pull-up.
    .pull_down_en = GPIO_PULLDOWN_DISABLE,
    .intr_type = GPIO_INTR_DISABLE
  };

  gpio_config(&pin_cfg);

  esp_rom_gpio_connect_out_signal(UPDI_TX_PIN, UART_PERIPH_SIGNAL(UPDI_UART_NUM, SOC_UART_TX_PIN_IDX), false, false);
  esp_rom_gpio_connect_in_signal(UPDI_RX_PIN, UART_PERIPH_SIGNAL(UPDI_UART_NUM, SOC_UART_RX_PIN_IDX), false);